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1 Of 2 Teen Girls Accused Of Making School Threat Charged As An Adult

CASTLE ROCK, Colo. (CBS4) - One of two 16-year-old girls accused of conspiring to kill students at Mountain Vista High School has been charged as an adult.

One of the two teens appeared in Douglas County Court on Tuesday morning and learned that their hearing will be rescheduled to Jan. 14. The other teen, Sienna Johnson, will be charged as an adult with conspiracy to commit murder. Prosecutors asked that she not be allowed to return to Mountain Vista High School.

A judge set Johnson's bond at $1 million at least until March 30 when the defense can move on another hearing to transfer Johnson's case back to juvenile court.

According to prosecutors, Johnson bought a BB gun to practice her shooting skills, drew a map of the planned attack and wrote "NBK" referring to the "Natural Born Killers" film in her journal. Prosecutors also say Johnson had been experimenting by hurting her pets.

Prosecutors are awaiting the results of a mental health exam and other evidence before deciding whether to charge the second girl as an adult. District Attorney George Brauchler, who represents Douglas County, said the results of the evaluation will be a key to the decision about charges.

"That's a very big, heady decision, and I want to be very smart about it. And the only way I can be super smart about it is to have as much information as possible, and that's why we have the delay today," District Attorney George Brauchler said.

In court on Tuesday the parents of the teen who hasn't been charged as an adult gave law enforcement the password to their daughter's cellphone. Prosecutors say they have been waiting to retrieve the records on the phone.

Few details about the alleged threat are available, but it is known authorities arrested the two girls in early December after recieving a tip regarding a threat against Mountain Vista High School in Highlands Ranch.

MOUNTAIN VISTA HIGH SCHOOL
(credit: CBS)

Brauchler told CBS4 he plans to continue to be personally involved in the case because of the seriousness of the allegations.

"The details haven't come out yet, but suffice it to say there is enough out there that I think people can conclude that this has the potential to be something that is of extreme significance to members of this community. I live in this community as well, and I think it's important that I remain intimately involved in the front end of this process," Brauchler said.

Brauchler said he may be involved all the way through trial if the case gets that far.

"This is important to get right, this is not a case that we want to guess wrong on, either for the juvenile, or for the community."

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